Machine for producing threads or grooves in plastic articles



Sept. 15, 1925.

C. VAN D. BENNETT MACHINE FOR PRODUCING THREADS OR GROOVES IN PLASTIC ARTICLES Filed July 1922 3 Shee tsSheet 1 nimm Sept. 15, 1925.

C. VAN D. BENNETT MACHINE FOR PRODUCING THREADS OR GROOVES IN PLASTIC ARTICLES Filed July 1, 1922 3 Sheets-Shea! 2 Sept. 15, 1925. 1,553,356

C. VAN D. BENNETT MACHINE FOR PRODUCING THREADS OR GBOOVES IN PLASTIC ARTICLES Filed July 1, 1922 3 Sheets-Sheet 3 5 IN V EN TOR. @rxzelzas @lafiameil Ez' ATTORNEY Patented Sept. 15,1925.

UNITED STATES PATENT orrlcs.

ncann: roa rnonucma rmana on enoovls in 2mm: anrrcnm.

, Application me m 1, 1m. lerlal Io. mp1.

To all whom it may concern:

.Be it known thatI, CORNELIUS VAN Dnm Bnmmrr, a citizen of the United States of America, residin at Lima, in the county of 6 Liv n and tate of New York, have invente certain new and useful Im rovements in Machines for Producing hreads or Grooves in Plastic Articles, of which the following is a specification.

M invention. relates to a machine for prod uc'n threads or grooves in lastic articles, an more particularly to t e threadin of insulators while in a plastic state.

e object of the invention is to provide a practical and durable mechanism which can be readily controlled and which will effect threading of an insulator in a minimum period of time. s

A further and more particular object is to 0 arrange the parts in such a manner as to produce a perfect thread without chippin or cracking the plastic body, and to pro uce the necessary operations in a speed and economical way, thereby reducing t e cost of threaded insulators to a The invention also comprehends certain other detailed improvements, all of which will 'appear clearly from the following description, when read in conjunction wit the accompanying drawings, the novel features being pointed out in the claims following the description. 1

In the drawings:

Figure 1 is a. general view in side elevation illustrating a preferred embodiment of the invention;

Figure 2 is a vertical sectional view showing the parts controlling the revolving and lateral motions of the threading member, and illustrating the threading member in its lowermost central positionwithin the insulator, just prior to its lateral movement;

Figure 3 is a'similar view showing .the parts when the threading member has been moved laterally;

F i re 4 is a sectional view on line 4-4 of Figure 1, showing a partlof the operating gearing in plan;

' Figure 5 is a sectional view on line 5-5 of Figure 1; v v

Figure 6 is a horizontal sectional view on line 6-6 of Figure 2;

Figure 7 :is a F1 re 3; F igure 8 is a sectional view on line 8-8 of lg'ure 2;

igure 9 is a sectional view on line 9-9 of Figure 3, the arrows showin the direct1on of movement of the severe? arts, and Figure 10 is a sectional view on me 10-10 of Figure 2. In general, the invention-comprises a carrier e that is movable vertically on suitable guides to bring a threading member downwardly into operative engagement with an insulator, and a rotary carrier on the frame for revolving the threadin member. The threadin member is norma located centrally of t e rotary carrier, an passing through the'latter is a positioning device which has an additional vertical movement with reference to the carrier. As the' posisimilar view on line 7-7 of or Inn, m YORK, America are mroacnum nnu, m xoax, A comma-Ion or saw your.

tioning device moves upwardly or down-' wardly in the carrier, it is given a lateral motion with reference to the carrier and carries the threading member laterally with it, thus actuating a position coinciding with the rotary axis of the carrier to a position spaced from said rotary axis, so that asthe carrier rotates, the

the threading member from,* i

threading member will be caused to revolve or move bodil around the rotary axis of the carrier.- eans are provided for rotating the threading member and the insulator, preferably at the same number of revolutions per minute and in the same direction, and revolving the threading member in an opposite direction to its axial rotation while engaged with the wall of the plastic material to be threaded.

In the disclosed arrangement, which is intended merely as an example of a preferred embodiment, 1 designates a base or table on which are mounted the vertical standards 2e connected at the top by a crosshead 3. Arranged for movement on the vertical standards 2 is a carrier frame, designated generall at 4, said frame being carried downwa when released, by its own weight and limited in its downward travel by the stops 5.. Mounted on the carrier e 4 is a support, said support consisting I I of vertical rods 6 extendin rier frame 4 and provi through the cared with nuts or .heads 7 at the bottom thereof whereby the carrier frame is elevated by lifting the rods 6, while 8 designate sto s on the rods 6 for limiting the downwar movement thereof relatively to the carrier frame 4. 9 des1gnates a horizontal plate connecting said rods 6, while 10 is a cross-head at the upper ends thereof, and connected by a cable 11 to any suitable elevating means for lifting or lower,.

ing the threading member with reference to the insulator. 1

The threading tool is desi ated at 11*, see Figures 1 to 3 inclusive, being fixedly attached to a shaft12. The shaft 12 is formed hollow at its upper end, as indicated at 13, and is connected to an arbor 14 so as to permit a relative sliding and to prevent any relative rotation between said parts for a purpose that will appear presently. The arbor 14 is connected by a universal jolnt 15 with a stub shaft 16, which in turn has a universal connection 17 with a spindle 18. The spindle 18 is journalled and sup orted on the plate 9, being movable upward y and downwardly therewith, and passes through the cross-head 3.

Splined on the spindle '18 is a gear 19 which is journalled. on the cross-head 3,

' while 20 is an intermediate gear engaging ,said gear 19 and actuated by a gear 21 fixed on the vertical shaft 22. The latter also has fixed thereon a bevel gear 23 which is engaged by a bevel pinion 24 carried by the driving shaft 25. 26 is a pulley fixed on said driving shaft 25 and operated by a belt 27 from the power shaft 28. The parts just referred to constitute the means for imparting the necessary rotation of the threads Y ing member about its own axis, and I will nowdescribe the means for effecting the lateral travel or feed of the threading membei', and also its revolving motion or bodily travel in a circular path.

To effect this, the shaft 12 is supported on and rotates in a box 29 which latter has attached thereto a plate 30, see Figure 10, resting on a rotary carrier. The rotary carrier comprises a drum or cylinder 31, bottom 32 and top 33, on which latter rests the plate 30'for supporting the box 29. The-rotary carrier is supported on the carrier frame 4,

being mounted on .ball bearings 34, and'has fixed at its upper end a gear 35 that is engaged and driven by a pinion 36- fixedly mounted on a vertical shaft 37. The latter is journalled in the carrier frame 4 and extends through the plate 9 and cross-head 3, having Splined thereon at its upper end a gear 38 which is journalled on the crosshead 3. The gear 38 is engaged by an inter-. mediate pinion 39 which engages the aforementioned gear 19, see Figures 1 and 4.

The driving gears are so related as to cause',the rotary carrier just described to turn in one direction while the threading member 11 rotates about its own axis in the o 'positedirection, the result being to cause t e threading member to revolve or move ,A positioning frame is arranged within the rotary carrier already described, said positioning frame comprising oppositely disposed vertical portions 40, engaging the box 29 on opposite sides thereof, as indicated in Figures 2, 3, 6 and 7. The vertical portions 40 are connected at their upper ends to a head 41, which is mounted throu h ball bearings 42 on the arbor 14 so that t e positioning frame is permitted to rotate with the rotary carrier already described, and also has avertical movement with the arbor 14' and shaft 18, and with reference to the rotary carrier.

The top and bottom 33 and 32 respectively of the carrier are slotted to receive the vertical rtions 40 of the. positioning frame and the inclined abutments 43 thereon, and

the carrier walls are provided with correpositioning frame is caused to .move later ally with reference to the carrier as it travels upwardly or downwardly, such change of position being indicated in Figures 2 and 3. As the positioning frame moves downwardl 'with reference to the rotary carrier, the ar or 14 telescopes within the shaft 12, so that the threading member, mountedon the shaft 12, rotates continuously about its own axis. In the osition of the parts shown in Figure 2, t e axis of rotation of the threading member corresponds with the rotary axis of the carrier, and the threading member, therefore,'has onl one movement, namely that of rotation, w ereas in Figure 3, the axis of the threading member has been moved laterally of the rotary axis of the carrier, owing to the downward travel of the positioning frame, and in this position of the parts, the threading member will rotate which is preferably rotated, and to this end is mounted on a table 47 to-which is at- A tached a rotary spindle 48 having fixed thereon a pinion 49, 50 is an intermediate pinion engaging the pinion 49 and in turn the aforementioned vertical s aft 22, the

aring arrangement being such as to turn 7 t e insulator or plastic material in the same direction as that in which the threading member rotates about its own axis, as indicated in Figure 9. The threading member and insulator preferably are rotated about their respective axes at the same rotational speeds, or in other words, make the same number of rotations per minute, while the threading memberrevolves or travels bodily in the opposite direction.

The 0 ration of the mechanism briefly is as fol ows: Assuming the parts to be in the position illustrated in Figure 1, an insulator is positioned in its holder, after which power can be appliedto lace the several parts in motion. The cab e 11 and cross-head 10 are then permitted to move downwardly by suitable releasin mechanism, and the weight of the carrier frame moves said parts together with the threading member downwardly'until they assume the position illustrated in Figure 2, in which the threading member is at the bottom of the opening. in the insulator, the lowermost part of the carrier frame being then in contact with the stops 5. The carrier frame can then move no further in a downward direction, although the support, consisting of member to the cross-head 10 and vertical rods 6, as well asthe spindle 18 and parts carried thereby, can move slightly furt er in a downward direction until the sto s 8 contact with the car rier frame, see i ure 1. This further downward travel of the spindle 18, stub shaft 16 and arbor 14 with reference to the carrier frame causes the downward movement of the positioning frame shown in Fig ure 3, thereby moving the threading member laterally against the wall to be formed on the insulator. When the threading opera tion is completed, the reverse operation takes place upon lifting the cable 11 and crosshead 10. The initial movement of said parts causes the threading member to be moved laterally until it again assumes the central position, with reference to the insulator, shown in Figure 2, after which further upward movement of the cross-head lifts the carrier frame and withdraws the threading siton shown in Fi V 1 to permit remova of the insulator. e stops 5 and 8 are adjustable to determine the respective movements of the several parts already described, in accordance with the requirements of the insulator or other work being performed.

' Whlle I have described the invention with reference to a particular embodiment, it is subject to modifications and chan es without departin from the fundamen y novel features, an this application is intended to cover any changes or modified arrangements that come within the intended scope of the improvements or of the following claims.

I claim:

1. The combination with a holder for plastic material, of a vertically movable carrier frame arranged thereabove, a rotarycarrier mounted on the frame, means for rotating thecarrier, a rotary threading tool normally located centrally of the carrier, and means for bodily shifting said tool laterally thereof to position it so as to revolve about the rotary axis of the carrier.

. 2. The combination with a holder for plastic material, of a vertically movable carrier frame arranged thereabove, a rotary carrier mounted on the frame, means for M tating the carrier, a rotary threading tool normally located centrally of the carrier, and means for bodily shifting said tool latcrally thereof to position it so as to revolve "about the rotary axis of .the carrier, said last mentioned means comprising a positioning frame cooperating with the threading tool and movable downwardly and laterally of the carrier.

3. The combination with a holder for plastic material, of a vertically movable carrier frame arranged thereabove, a rotary carrier mounted on the frame, means for rotating the carrier, a rotary threading tool normally located centrally of the carrier, and means for bodily shifting said tool laterally of the carrier to position it so as to revolve about the rotary axis of the carrier, said last mentioned means com rising a positioning frame cooperating wit the threading tool and movable downwardly of the carrier, inclined guides on the carrier, and abutments on the positioning frame engaging said inclined ides to cause a lateral shifting of the positioning frame during its downward movement.

4. The combination with a holder for plastic material, of a vertically movable carrier frame arranged thereabove, a rotary carrier mounted on the frame, means for rotating the carrier, a rotary threading tool normally located centrally of the carrier, meansfor shifting said tool on the carrier to position it so as to revolve about the rotary axis of the carrier, means for imparting a rotary motion to the threadin tool about its own axis independently of its revolving motion with the carrier, and means for rotating said holder for plastic material. 5. The combination with a holder for plastic material, of a vertically movable carrier frame arranged thereabove, a rotary carrier mounted on the frame, means for rotating the carrier, a rotary threading tool normally located centrally of the carrier frame, means for bodily shifting said tool laterally of the carrier to position it so as to revolve about the vertical axis of the carrier, means for imparting a rotary motion to the threading too] about its own axis independently of its revolving motion with the carrier, and means for rotating said holder for plastic material.

6. The combination with a holder for plastic material, of a vertically movable carrier frame arranged thereabove, a rotary carrier mounted on the frame, means for rotating the carrier, a rotary threading tool normally located centrally of the carrier, means for bodily shifting said tool laterally of the carrier to position it so as to revolve about the rotary axis of the carrier, said last mentioned means comprising a ositioning frame movable downwardly and aterally of the carrier and cooperating with the threading tool.

7. The combination with a holder for plastic material, of a vertically movable carrier frame arranged thereabove, a rotary carrier mounted on the frame, means for rotating the carrier, a rotary threading tool normally located centrally of the carrier, means for bodily shifting said tool laterally of the carrier to position it so as to revolve about the rotary axis of the carrier, said last mentioned means comprising a positioning frame cooperating wit the threading tool and movable downwardly of the carrier, inclined ides on the carrier, abutments on the ositioning frame engaging said inclined gui es to cause a lateral shifting of the positioning frame during its downward movement, means for imparting a rotary motion to the threading tool about its own axis independently of its revolving motion with the carrier, and means. for rotating said holder for plastic material.

8. The combination with a holder for plastic material, of a vertically movable car- 40 rier frame arranged thereabove, a rotary carrier mounted on theframe, a support for the carrier frame having an additional downward movement after the carrier frame reaches its lowermost position, means for ro- 9. The combination with a holder for ositioning frame actin to move plastic material, of a vertically movable car 65 rier frame arranged thereabove, a rotary carrier mounted-on the frame, a support for the carrier frame having an additional downward movement after the carrier frame reaches its lowermost position, means for rotating the carrier, a rotary threading tool normally located centrally of the carrier, and a positionin frame cooperatin with the threading too? and mounted on said support, the positioning frame acting to move 5 the threading tool bodily in a direction downwardly and laterally of the carrier.

In witness whereof, I have hereunto signed my name. i CORNELIUS VAN DYKE BENNETT. 

